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Montevideo unitObstetrics A graphic portrayal of uterine activity that corresponds to the product of the uterine contractions/10 mins multiplied by the intensity of the contractions–the average intrauterine pressure peaks of all contractions in the same 10 min span. See Deceleration.
Mon·te·vi·de·o unit(mon'tĕ-vi-dā'ō yū'nit)
Montevideo unit(mon″tā-vi-dā′ō) [ Montevideo, Uruguay, where the procedure was developed],
After an intrauterine pressure catheter is inserted, the baseline intrauterine pressure is recorded. The difference between the baseline pressure and the pressure during each contraction of the uterus in a 10-min period is calculated. For example, in a patient with a baseline uterine pressure of 15 mm Hg, and four intrauterine contractions, each of which has a peak pressure of 70 mm Hg, the difference is (70−15 = 55). The sum of these four pressure differences (in this idealized case: MVU = 4 × 55 = 220) is compared to a normal standard. An MVU of > 200 predicts normally progressive labor 90% of the time. An MVU < 200 suggest protraction of labor or frank arrest of labor.